210120221012221 has 8 divisors (see below), whose sum is σ = 226283602268024. Its totient is φ = 193956880803840.

The previous prime is 210120221012171. The next prime is 210120221012263. The reversal of 210120221012221 is 122210122021012.

It can be written as a sum of positive squares in 4 ways, for example, as 130402376616996 + 79717844395225 = 11419386^2 + 8928485^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210120221012221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210120221016221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 812485 + ... + 20515861.

It is an arithmetic number, because the mean of its divisors is an integer number (28285450283503).

Almost surely, 2^{210120221012221} is an apocalyptic number.

It is an amenable number.

210120221012221 is a deficient number, since it is larger than the sum of its proper divisors (16163381255803).

210120221012221 is a wasteful number, since it uses less digits than its factorization.

210120221012221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20523711.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 210120221012221 its reverse (122210122021012), we get a palindrome (332330343033233).

The spelling of 210120221012221 in words is "two hundred ten trillion, one hundred twenty billion, two hundred twenty-one million, twelve thousand, two hundred twenty-one".